Ultraviolet radiation source with envelope having pressure equalization region
US4000431A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1976 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Mar 1, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device for producing ultraviolet radiation of high spectral radiation intensity is disclosed in which the radiation is generated in a mercury-argon-filled discharge tube with a thermoemissive cathode by a wall-stabilized d.c. gas discharge at a mercury pressure p.sub.Hg between 5 .times. 10.sup.-.sup.3 and 5 .times. 10.sup.-.sup.1 torr, an argon pressure p.sub.Ar between 0.01 and 10 torr and a current density j.sub.o of the discharge current I between 1 and 25 A/cm.sup.2, and in which the two electrode spaces are connected to one another through a pressure-equalization region as well as through the discharge region wherein the two electrodes are arranged in tandem in a common envelope, the two arms of the discharge region are joined to the end of the envelope nearest the discharge region so that one arm projects coaxially into the envelope and passes through the toroidal electrode nearest the discharge region, and the inner wall of the envelope and the arm projecting into the envelope are each provided with a collar between the two electrodes, the collars being so arranged with respect to one another as to form a connecting passage acting as a pressure-equalizing region running b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.